SHURflo Strainer Wrench
On my yacht I have SHURflo Extreme pumps with water strainers. Sometimes it's hard to unscrew the strainer cap with hand. I don't want to use big metal pincers as the cap is made from acrylic glass.
I have another wrench already designed: https://www.thingiverse.com/thing:2516598
So with little modification here is SHURflo Extreme Series Strainer (Code 254-XXX) wrench: https://www.asap-supplies.com/eu/shurflo-high-flow-pump-strainer-509610
Probably will work with many other filters.
Mine was printed in ABS. But I think it doesn't matter.